fix(fe): resolve slot template hierarchy in ModelList and verify 5/5 Playwright E2E DOM tests

frontend/src/features/models/pages/ModelList.vue

@@ -126,9 +126,7 @@ const handleRetry = () => {
       </section>
     </template>
 
-    <!-- Master List Slot -->
-    <div class="content">
-      <!-- Master: List -->
+    <template #master>
       <aside class="master-list" aria-label="모델 목록">
         <h2>Models ({{ filteredModels.length }})</h2>
         <ul class="items" role="list">
@@ -171,8 +169,10 @@ const handleRetry = () => {
           </li>
         </ul>
       </aside>
+    </template>
 
-      <!-- Detail: Right Panel -->
+    <!-- Detail: Right Panel Slot -->
+    <template #detail>
       <main class="detail-panel" role="main" aria-label="모델 상세 정보">
         <h2 v-if="selectedModel" :aria-label="`Selected model: ${selectedModel.name}`">{{ selectedModel.name }}</h2>
         <div v-else class="empty-detail" role="status" aria-live="polite">Select a model to view details</div>
@@ -255,7 +255,7 @@ const handleRetry = () => {
           </section>
         </div>
       </main>
-    </div>
+    </template>
   </MasterDetailCrudPage>
 </template>